var trs = document.querySelectorAll("#Table1>tbody>tr").length;
for(var i = 2;i <= trs;i++){
    var sss  = "#Table1>tbody>tr:nth-child("+i+") td:nth-child(3) table tbody tr td:nth-child(1) input";
    document.querySelector(sss).checked=true;
}
document.querySelector("textarea").value='我对本课程很满意，愿向朋友推荐该老师的课程。老师辛苦了！';
document.querySelector('[name=btnSave]').value='√ 自动填写完毕';
setTimeout(function(){document.querySelector('[name=btnSave]').value='提交';},2000);
//setTimeout(function(){document.querySelector('[name=btnSave]').onclick()},2000);
